模拟氮沉降对华西雨屏区光皮桦林土壤酶活性的影响

应用生态学报 ›› 2012, Vol. 23 ›› Issue (08): 2129-2134.

模拟氮沉降对华西雨屏区光皮桦林土壤酶活性的影响

涂利华¹,胡红玲^1,2,胡庭兴^1**,张健²,肖银龙¹,雒守华¹,李仁洪³,戴洪忠¹

(¹四川农业大学林学院, 四川雅安 625014; ²长江上游林业生态工程四川省重点实验室, 成都 611130; ³四川省林业调查规划院, 成都 610081)

出版日期:2012-08-18 发布日期:2012-08-18

Effects of simulated nitrogen deposition on soil enzyme activities in a Betula luminifera plantation in Rainy Area of West China.

TU Li-hua¹, HU Hong-ling^1,2, HU Ting-xing¹, ZHANG Jian², XIAO Yin-long¹, LUO Shou-hua¹, LI Ren-hong³, DAI Hong-zhong¹

(¹College of Forestry, Sichuan Agricultural University, Ya’an 625014, Sichuan, China; ²Sichuan Province Key Laboratory of Forestry Ecological Engineering in Upper Reaches of Yangtze River, Chengdu 611130, China; ³Sichuan Institute of Forestry Inventory and Plan, Chengdu 610081, China)

Online:2012-08-18 Published:2012-08-18

摘要/Abstract

摘要： 在华西雨屏区光皮桦(Betula luminifera)人工林内设置不同氮沉降水平(0、5、15和30 g N·m^–2·a^–1)的模拟氮沉降试验,研究氮沉降对林地土壤酶活性的影响.结果表明: 模拟氮沉降促进了光皮桦人工林土壤中水解酶(蔗糖酶、纤维素酶、酸性磷酸酶和脲酶)活性,抑制了氧化酶(多酚氧化酶和过氧化物酶)活性.土壤水解酶活性的增强预示着在活性氮增加的情况下,光皮桦和土壤微生物对碳、磷元素的需求增加.外源无机氮的增加显著降低了土壤多酚氧化酶和过氧化物酶的活性,可能导致凋落物分解受到抑制,促进凋落物在土壤中的积累,并通过抑制土壤有机质的分解增加土壤中碳的贮存量.

Abstract: From January 2008 to January 2009, a field experiment was conducted to investigate the effects of simulated nitrogen (N) deposition (0, 5, 15, and 30 g N·m^-2·a^-1) on the soil enzyme activities in a Betula luminifera plantation in Rainy Area of West China. As compared with the control (0 g N·m^-2·a^-1), simulated N deposition stimulated the activities of soil hydrolases (β-fructofuranosidase, cellulase, acid phosphatase, and urease) significantly, but depressed the activities of soil oxidases (polyphenol oxidase and peroxidase). These results suggested that the increased exogenous inorganic N could stimulate soil microbial activity and increase the demands of both B. luminifera and soil microbes for C and P, whereas the depress of soil polyphenol oxidase and peroxidase activities under N addition could inhibit the degradation of litter and promote its accumulation in soil, leading to the increase of soil C storage in the B. luminifera plantation ecosystem.

涂利华1,胡红玲1,2,胡庭兴1**,张健2,肖银龙1,雒守华1,李仁洪3,戴洪忠1. 模拟氮沉降对华西雨屏区光皮桦林土壤酶活性的影响[J]. 应用生态学报, 2012, 23(08): 2129-2134.

TU Li-hua1, HU Hong-ling1,2, HU Ting-xing1, ZHANG Jian2, XIAO Yin-long1, LUO Shou-hua1, LI Ren-hong3, DAI Hong-zhong1. Effects of simulated nitrogen deposition on soil enzyme activities in a Betula luminifera plantation in Rainy Area of West China.[J]. Chinese Journal of Applied Ecology, 2012, 23(08): 2129-2134.